SPEED CONTROLLING AN ELECTRIC MACHINE OF A HYBRID ELECTRIC VEHICLE
First Claim
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1. A hybrid powertrain comprising:
- an engine having a crankshaft;
an electric motor including a rotor selectively coupled to the crankshaft via a disconnect clutch;
a transmission including a torque converter having an impeller fixed to the rotor; and
a controller configured to, in response to the engine starting, generate a torque command for the motor that defines a magnitude that is based on a difference between a target impeller speed and a measured impeller speed.
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Abstract
A hybrid powertrain includes an engine having a crankshaft, and an electric motor having a rotor selectively coupled to the crankshaft via a disconnect clutch. The powertrain further includes a transmission having a torque converter that has an impeller fixed to the rotor. A controller is configured to, in response to the engine starting, generate a torque command for the motor that defines a magnitude that is based on a difference between a target impeller speed and a measured impeller speed.
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Citations
20 Claims
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1. A hybrid powertrain comprising:
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an engine having a crankshaft; an electric motor including a rotor selectively coupled to the crankshaft via a disconnect clutch; a transmission including a torque converter having an impeller fixed to the rotor; and a controller configured to, in response to the engine starting, generate a torque command for the motor that defines a magnitude that is based on a difference between a target impeller speed and a measured impeller speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A vehicle comprising:
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an engine including a crankshaft; a transmission including a torque converter having an impeller, and a turbine fixed to a turbine shaft that is driveably connected to driven wheels of the vehicle, wherein the torque converter further includes a bypass clutch configured to selectively lock the impeller and turbine relative to each other; an electric machine including a rotor selectively coupled to the crankshaft via a disconnect clutch and fixed to the impeller; a speed sensor disposed within the transmission and configured to output a speed signal indicating a measured impeller speed; and at least one controller configured to, in response to a change in torque split between the engine and the electric machine, and the bypass clutch being open or slipping, generate a torque command for the electric machine that includes a feedforward component, and a feedback component that is based on an error between a target impeller speed and the measured impeller speed. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method of controlling an electric machine of a hybrid powertrain that includes an engine, a transmission, and a torque converter having a turbine, an impeller fixed to the electric machine, and a bypass clutch, the method comprising:
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generating a command to start the engine; and in response to the command to start the engine and the bypass clutch being open or slipping, generating a speed-control torque command for the electric machine that defines a magnitude that is based on a difference between a target impeller speed and a measured impeller speed. - View Dependent Claims (19, 20)
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Specification